Knock-over bit apparatus



jan. 1?9 w33 c. x-ULSCHER ET AL. 1y8949538 KNOGK-OVER BIT APPARATUS Filed Dec. 19. 1930 Patented Jan. 17, 1933 UNITED STATES CURT HILSGHER AND ANTON LOIMANN, F CHEIVINITZ,` GERMANY KNOCK-OVEIR BIT APPARATUS Application led December 19, 1930, Serial No. 503,404, and in Germany August 16, 1930.

This invention relates to a knock-over bit apparatus for taking the meshes off the needles in cotton machines. The apparatus includes sets of long and short knock-over bits divided into roups for the purpose of automatically, W en desired, bringing certain portions of the fabric beneath the short bits and thus out of working position, While other portions of the fabric are retained in working position above the long bits. An apparatus of this type is shown in U. S. Patent No. 1,876,417, September 6, 1932.

In the operation of. aknock-over bit apparatus of this sort, the downward movement of the needles will carry the fabric a ainst the upper surface of the long bits, w ile at the same time the row of needles may be so lpositioned that the portionsl of fabric opposite short bits will be carried down and brought beneath the latter.

In the learlier forms of construction, no provision Was made for bringing the fabric which had been brought below the bits back again into its upper working position, and

this had generally to be done by hand. In the apparatus of the present invention means are provided for retaining these parts of the fabric close beneath the short bits in order that they may readily be brought above the bits, simply by certain automatic motions of the needles. To this end the short knock-over bits are provided with protruding beaks placed so as to form a slit between the beaks and the bottom of the bits. Portions of the fabric may thus be brought below the bits and retained in the slit until it is desired to Work these portions again. The fabric may then be 40 moved out of the slit and up into working position automatically by a relatively slight upward movement of the needles. p

A practical embodiment of the invention is represented in the accompanying drawing, in which Fig. l shows the initial position of the mesh-forming parts.

Fig. 2 shows the position of the fabric c after being brought downward by the move- Irlient of the needles and inserted into the s it o.

Fig. 3 shows the first stage of the upward movement, at the moment when the necdios have broughtthe fabric e in the direction of the arrow out of the slit o beneath the n1ov- 5r, able knock-over bit d.

Fig. 4L shows how the needles are able on their upward movement to take the fabric e up into Working position past the ends of the short knock-over bits. G0

Fig. 5 shows the upward movement of the needles at approximately its final stage, the needles starting to move in the direction of the arrow toward the back of the machine.

Fig. 6 shows the needles at their extreme o5 point toward the back of the machine, the

-fabric e now being in position to Abe worked above the knock-over bits.

Fig. 7 represents a modified form of construction in which the bcaks are formed by separate projecting members, instead of being made as a part of the short knock-over its.

As shown in the drawing, the short bits d are provided with a beak (Z1 so arranged 75 as to form a slit o between the top of the beak and the under side of the bit.

In Figs. 3 to 6 is shown a portion f of the, fabric which is retained continuously in Working position and so is worked to form a loop while another portion c is held under the bits without being worked. The portions c of the fabric which are drawn in heavy lines are those which are periodically brought below and above the bits. Those portions S5 of the fabric which are drawn in light double lines show the. parts of the fabric which are worked along While the portion c is held at rest.

The distance between the needle c and the im line g shows the number of meshes which is necessary (approximately the length of the knock-over bits) to permit separation of the fabric into portions below and above the bits. The point g thus forms the apex-point of the connection between the fabric portions e and f.

Naturally there will not be en one and the same needle simultaneously the fabric e and the fabric or fabric loop f, but there will be on the needles in the sections o' the short bits the fabric e and in the sections of `the long bits the fabric The beaks d1 may be made to form one piece with the short bits d, or they can, as

shown in F ig. 7 be formed by the separate projecting members it which are xed in the bit support i in any suitable manner, so as to form the slit vbetween the short knockbver bits d and the members it.

The mode of operation may be summarized as follows:

On beginning to work the foot portion, it is intended to automatically bring the fabric of the middle part which has been held blocked within the slit outof said slit. This is eiected by causing the needles a to make a greater movement forward (toward the right in Fig.. 4) so that the meshes of the portion e may, on the upward movement of the needles, pass by the front edge of the short knock-over bits,I and so can be carried upward by the needles over said bits, being thus brought into working position above the bits as clearly shown in Figs. 5 and 6. It will be understood that these parts remain in Working position so long as the needles are not moved forward beyond the ends of the short bits.

What we claim is:

1. A knock-over bit apparatus for taking the meshes'o the needles in cotton machines comprising, a group of longer knock-over bits, a group ofshorter knock-over bits, the machine needles and bits being relativ-ely movable so as to permit an edge of the fabric to pass the ends of the shorter bits in a vertical direction, and means for preventing those portions o f the Kfabric edge which are brought down past the ends of. the shorter bits from following the full downward motion of the needles.

2. A knock-over bit apparatus for taking the meshes oil the needles in cotton machines comprising, a. group of longer knock-over bits, a group of shorter knock-over bits, the

ymachine needles Vand bits being relatively movable so as to permit an edge of the fabric to pass the ends of the shorter bits in a vertical direction, and projecting members beneath the shorter bits and disposed to form a fabric-receiving slit between said bits and said members.

3. A knock-over bit apparatus for taking the meshes oli the needles in cotton machines comprising, a group of longer knockover bits, a group of shorter knock-over bits, the machine needles and bits being relatively movable so as to permit an edge of the fabric to pass the ends of the shorter bits in a vertical direction, and members projecting beneath and beyond the ends of the shorter bits, and disposed to form a fabric-receiving slit between said bits and said members.

In testimony, that we claim the forego ing as our invention, we have Signed our names this `5th day of December 1930.

CURT HILSCHER.

ANTON LOIMANN. 

